I breastfed my girl until she was almost two. After she turned a year, I went back to full-time work so I had to wean her off for both our sakes. But I did nurse her in the morning and before bed. After a few months, I stopped the morning nursing. I was undecided whether to stop nursing before bed. She was sleeping through the night anyway and it was simply a comfort thing. We continued and pretty much stopped when I got pregnant with my second as it wasn't comfortable.

I think both mom and child should continue nursing for as long as they want. I know parents who nursed their kids until three, and I've seen videos of moms nursing a six year old. Personally, I'd find it weird to be nursing past three. I knew I didn't want to be tandem breastfeeding when I had my second so that's another reason for ending the nursing with my first.

Nursing may sometimes be a factor if toddlers don't eat enough of regular food or don't sleep well through the night. Then I would look at how I nurse my child (along with other factors of course).

I nursed my eldest until 19 months, my middle child until 27 months, and my third is still nursing, and will turn 2 on the 22nd of July.  I have no plans to wean her, and do not know at what age I would feel uncomfortable nursing her.  I guess there is a limit, but I don't feel that I have to figure it out in advance.  I think it will be something that we will just figure out, day by day together.